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x in (-oo:+oo)
5*x-(7*x)+3 = 27 // - 27
5*x-(7*x)-27+3 = 0
5*x-7*x-27+3 = 0
-2*x-24 = 0 // + 24
-2*x = 24 // : -2
x = 24/(-2)
x = -12
x = -12
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